DTK AT BIOS Post Codes
- 01 - Testing the CPU
- 03 - Initialize the 8259 interrupt controller
- 05 - Initialize the video board - MCA & CGA
- 0D - Initialize the 8237 DMA controller
- 0E - Initialize the DMA 74612 page registers
- 12 - Test the 8042 keyboard controller
- 16 - Test the DMA 7237 controller and 8254 programmable interrupt timer
- 22 - Testing DRAM refresh circuitry
- 25 - Base 64KB memory test
- 30 - Set up system stack
- 33 - Read-system configuration through 8042 keyboard controller
- 37 - Test keyboard clock and data line
- 40 - Determine video type
- 44 - Locate and test, if present, MDA and CGA video
- 48 - Initialize video 80 x 25 mode
- 4D - Display DTK BIOS copyright message
- 4F - Check serial and parallel ports
- 50 - Check floppy disk controller
- 55 - Check shadow RAM
- 58 - Display total memory and switch to real mode
- 5A - Successful switch back to real mode
- 60 - Check hard disk drive controller
- 62 - Initialize floppy drive
- 65 - Initialize hard drive
- 67 - Initialize the floppy disk drive and the hard disk drive
- 6A - Disable gate A20 and test math coprocessor
- 70 - Set system date and time RTC-146918
- 77 - Call interrupt 19 boot loader